Chain pipe wrench



Oct. 20, 1931. F. J. CARNELLI CHAIN PIPE WRENCH Filed April 24,- 1950 iatented Get. 23, 1931 PATENT OFFICE FRANCIS J'. CARNELLI, OF NEW YORK, N. Y.

CHAIN PIPE WRENCH Application filed April 24,

This invention relates to wrenches especially adapted for pipes, wherein the pipe is held against an angular jaw portion by a link chain, so that on swinging the handle a pipe willbe gripped and turned; and which device will cause the chain to be held in the body member in close proximity to the jaws, whereby the handle can be swung on both sides of the neutral position, to permit turning the pipe in either direction; and which also will permit of the handle being swung back a short distance to release the chain on the pipe and a fresh grip pad to further swing the pipe in the same direction.

A further object of the invention is to provide a device of this character that comprises a body member in the form of a handle, and a pair of jaw plates secured to the handle, with means for connecting a chain to opposite ends ot'the aws, and wherein the aws have a special engagement with the end of the handle to take up the strain at this place, and which will further provide extensions at the middle portions of the jaws that will engage the handle for support, and which will provide means for engaging a small fitting at this location. In the accompanying drawings showing one embodiment of my invention Fig. 1 is a side elevation of the wrench.

Fig. 2 is a partial plan view.

Fig. 3 shows enlarged the jaw portion of the wrench.

Fig. 4 is an end view of one jaw and connected parts.

Fig. 5 shows one of the jaws detached.

Fig. 6 is an end view of the handle.

Fig. 7 isapartial view of the other jaw.

Fig. 8 is an end view looking to the left of. Fig. 3.

The device comprises essentially a body member comprising a handle, and a pair of jaws secured at one end of the handle, and a link chain connected with the body to pass around the pipe and tightly'secured to the body or j aw members.

1930. Serial No. 446,894.

As shown I provide a handle member in the form of a bar 8, and jaw members composed of plates 9 and 10, that are secured to the handle by a cross bolt 11 passing through a bore 12 in the handle and holes 13 and 1 1 in the plates. The plate 9 has a grooved portion 15 on its inner face, and the plate 10 a similar grooved portion 16 to engage the margins of the head portion 17 of the bar, with the holes registering. It will be seen that the plate 9 has the angular faces 18 and 19 provided with teeth, and at the innermeeting end of these faces an extension 20 is provided that projects inwardly across the end 21 of the handle bar 8, for about one half of its face. The other jaw 10 has similar angular faces 22 and 23, and is provided with an extension 24- at the middle portion corresponding with the extension 20, that will also abut the end 21 of the handle. These extensions project into engagement of each other across the space by which the jaws are separated at their outer portions, and the inner part of the jaws is continuous from one side to the other, to further receive small fittings or a small comparatively weak pipe that might bend it sup ported only by separated jaw faces.

The end 21 of the bar, and the two abutting walls of the extensions are provided with interlocking rib and groove. In the arrangement shown the bar is provided with a rib 25, and the extensions are provided with grooves 26 and 27, that aline and each receive half of the rib 25.

Not only do these abutting walls receive the strain or direct thrust of the jaws on the handle bar, but this rib tends to prevent the twist of the handle in the grooved portions of the jaws when the handle is swung to turn the pipe, because the latter is locked directly to the jaws.

Suitable means are shown for securing a link chain .30 to the body, preferably to the jaws directly. The opposite inner walls. of the jaws are provided with lugs 31 and 32 on opposite sides of the jaws that are grooved to act as hooks to engage the projecting pins 33 on the chain in the usual manner. The other end of the chain is provided with a suitable attachment, such as a bolt 34. pivoted to the end link 35 of the chain, and engaged by a nut 36 that turns in socket portions 37 and 38, in the jaw plates.

In the use of the device, the article such as a pipe 38 is placed against the jaws, and the chain engaged at the lugs 31 and 32 by passing the pins around the lugs as shown, and which is made as tight as it can be drawn. Then the nut is turned to move the bolt rearward until the desired tension is provided. When the handle is swung it will tend to turn in its grooved portion of the jaws, but it will be held therein, at the bolt, and the rib on the end of the handle bar engaging the extensions of the jaws will prevent any possible lateral movement of the handle and rela ti ve to the jaws.

It will be seen that a device of this character is comparatively simple yet strong and rigid, comprising the handle bar and the two jaw plates,'that are shaped as shown and simply assembled and secured by the smgle bolt. The nut is then placed in the double socket and the bolt on the chain is inserted, whenthe device is ready for use, in the manner set forth.

What I claim is 2-- 1. In a chain wrench, a body comprising a handle and a pair of jaw plates secured to one end of the handle forming two separated angular plates making an obtuse angle and provided with teeth, each plate hav ngan extension at the middle portion pro ecting toward the other extension and which extensions abut the end of the handle, said abutting members having a rib on one member with the other member provided with a groove to engage said rib with the rib and groove extending transverse to the said plates, said jaw plate extensions being provided with teeth and each forming an angular face alining with the angular faces of the plates, a link chain, means for attaching one end of the chain to the body at one side of the jaws,

and adjustable means for securing the other end portion of the chain to the body on the opposite side of the device.

2. In a chain wrench, a body comprising a handle and a pair of jaw plates secured to one end of the handle forming two separated lar plates making an obtuse angle and provided with teeth, each plate having an extension at the middle portion projecting toward the other extension, and which extensions abut the end of the handle, said abutting members having a rib on one member with the other member provided with a groove to engage said rib with the rib and groove extending transverse to the said plates, said M jaw plate extension being provided with teeth, and each forming an angular face alining with the angular faces of the plates, a chain having a threaded stem at one end, the body having a socket to receive the stem and also having an opening extending across said socket, a nut ring inserted in said socket to receive the threaded stem by turning the nut, the body member having on one side an open slot with lugs in the opposite slot walls, said lugs being arranged to form substantially U-shaped recesses opening laterally of the body, the chain having pins on opposite sides adapted to engage said lugs on insertion of the chain, whereby the chain can pass around a pipe or fitting that engages said angular faces of the jaws and extensions and be gripped thereon by said adjustment, said chain supports being in close proximity to the jaw faces respectively whereby the chain will enclose a very large part of the pipe and effect a very quick grip and release of the pipe, with very small movement of the handle.

3. In a chain wrench, a body comprising a handle and a pair of jaw plates secured to one end of the handle forming two separated angular plates making an obtuse angle and provided with teeth, each plate having an extension at the middle portion projecting toward the other extension and which extensions abut the end of the handle transverse to the said plates, a rib on the end of the handle, the said extensions each having a slot on the abutting faces that receive said rib, said jaw plate extensions being provided with teeth and each forming an angular face alining with the angular faces of the plates, a link chain, means for attaching one end of the chain to the body at one side of the jaw, and adjustable means for securing the other end portion of the chain to the body on the opposite side of the device.

4. In a chain wrench, a body comprising a handle and a pair of jaw plates secured to one end of the handle forming two separated angular plates making an obtuse angle and provided with teeth, each plate having an extension at the middle portion projecting toward the other extension, and which exten sions abut the end of the handle, a rib on the end of the handle, the said two extensions each having a slot on the abutting faces that receive said rib, said jaw plate extensions being provided with teeth, and each forming an angular face alining with the angular faces of the plates, a chain having a threaded stem at one end, the body having a socket to receive the stem and also having an opening extending across said socket, a nut ring inserted in said socket to receive the threaded stem by turning the nut, the body member having on one side an open slot with lugs in the opposite slot walls, said lugs being arranged to form substantially U-shaped recesses opening laterally of the body, the

chain having pins on opposite sides adapted FRANCIS J. GARNELLI. 

